aptitude install -s tortoisehg
The following NEW packages will be installed:
mercurial{a} mercurial-common{a} python-qscintilla2{a} tortoisehg{b}
The following packages are RECOMMENDED but will NOT be installed:
python-iniparse python-pygments
0 packages upgraded, 4 newly installed, 0 to remove and 1 not upgraded.
Need to get 4788 kB of archives. After unpacking 21.6 MB will be used.
The following packages have unmet dependencies:
tortoisehg : Depends: mercurial (< 2.10~) but 3.0-1 is to be installed.
The following actions will resolve these dependencies:

Keep the following packages at their current version:
1) tortoisehg [Not Installed]

Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

Accept this solution? [Y/n/q/?] y
The following NEW packages will be installed:
mercurial{a} mercurial-common{a} python-qscintilla2{a} tortoisehg
The following packages are RECOMMENDED but will NOT be installed:
python-iniparse python-pygments
0 packages upgraded, 4 newly installed, 0 to remove and 1 not upgraded.
Need to get 4764 kB of archives. After unpacking 21.5 MB will be used.